physics Chapter 003.pdf - UNIT 3: DYNAMICS 1. Define...

OXFORD ISLAMIC SCIENTIFIC SCHOOL |IX PHYSICS 1
1. Define Dynamics.
Dynamics is the study of cause of motion. In common, force is a cause of motion.
Several other factors like mass of the object and frictional force also affect the
motion of an object. These factors are also studied under dynamics.
2. Define Force.
Force is the agent that changes the state of rest or uniform motion of a body.
Its SI unit is Newton (N) and it is a vector quantity.
Force is required to change the position, state or shape of an object.
Force can act as pull or push agent. Force produces acceleration. It can produce
distortion.
3. Define One Newton.
One Newton (1 N) is the amount of force that can produce 1 ms -2 acceleration in 1
kg mass.
4. Define Momentum.
Momentum is defined as quantity of motion contained in a body
.
The momentum
of an object is equal to the mass multiplied by the velocity of the object.
Momentum = mass x velocity
Symbolically, the momentum is represented by p .
Thus, the above equation can be written as
p = mv
where m is the mass and v is the velocity. The momentum is vector quantity
UNIT 3: DYNAMICS

2 IX PHYSICS| OXFORD ISLAMIC SCIENTIFIC SCHOOL
5. What is the SI unit of Momentum?
6. Derive Δ p = Ft

7. How force of momentum works in different safety devices. Give an
example.
OXFORD ISLAMIC SCIENTIFIC SCHOOL |IX PHYSICS 3